Milling and paralleling machine



' MILLING AND PARALLELING MACHINE Filed Aug. 18, 1957 2 Sheets-Sheet l INVENTOR. .EYY/YUETE. Wm

A TTORNE Y.

0t.11,193s. EEWELCH 2,132,503

MILLING AND PARALLELING MACHINE Filed 18, 1957 2 Sheets-Sheet 2 INVENTOR. EfU/QETJZZ ZIAZZGJ .4 TTORNE Y.

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more fully explained.

Patented Oct. 11, 1938 MILLING ANDPARALLELINGMAGHINE" v I Emmet I WeIchJTopeka, Karis'. A Asturias;Auguste, 1537; Serial No. 159,676 T 1 (01. 90-21) My invention relates toa milling and parallelingm'achine r The object of my invention i s to-p "ovide a millingxand'parallelingimachine, primarily for use in the preparation of dental bridges, comprising a rotating bit mounted above a seat arranged for movement in a' plane normal to the axis of the bit.

A further object of my invention is to provide a machine of the kind described in which the movement of the seat can be accomplished in two directions precisely at ninety degrees.

These and other objects will. hereinafter be Referring tothe drawings in which like characters apply to like parts in the different views: I r

Figure 1-is an elevation of the machine showing an adjustable base carrying a casting, positioned in the seat.

Figure 2 is a plan view of Figure 1 with the tool post shown in section.

Figure 3 is a fragmentary plan View showing the bit mechanism and adjustments.

Figure 4 is an enlarged section taken on the line 4-4 in Figure 2. V

Figure 5 is a fragmentary view of one end of the carriage showing the driving and locking means.

Figure 6 is an enlarged plan view of the seat.

Figure 7 is an enlarged view of the chuck and bit with respect to the work.

i The machine described has a bed plate I, upon which are mounted a tool post 2 and four rail that of the rails and 8.

posts 3, 4, 5 and 6 respectively. A guide rail 1, is supported between the posts li and 4 and a similar guide rail 8 is supported between the posts 5 and 6. The rail 8 is parallel to the rail 7. A rack 'l' is affixed to the rail 1 and similarly a rack 8 is affixed to the rail 8 in such a manner as to allow the teeth of the racks to extend below the lower surfaces of the respective rails. The carriage 9 is slideably mounted on the rails 1 and 8 as shown at A and B. The guide rails Ill and I! are supported in the endsv of the carriage and are parallel to each other. The rails l0 and II are positioned in a direction 90 degrees to the rails 1 and 8. The plane of the rails l0 and II is parallel to The shaft I2, trunnioned in the bearings l3 and I4 at each end of the carriage 9 has a driving wheel at one end and adjacent thereto a locking wheel l6 which engages the threaded portion of the shaft l2 at C.

' A pinion gear I! is mounted on the shaft [2 and engages the rack 8'. A similar gear l8 engages mately over the center of the base I.

' sleeve 28.

'arm 21.

"inlays.

same plane and in many cases one cut may re-.

wise rotation of'the'locking wheel lii until 'it'is'in firm contact with the bearing t3: provides a brake to set the; carriage 9'a'gainstjmovementg The seat '19 isslideablyunountedon the" rails It and I l. The shaft is carried in the -bearings 2i and 22 on the lower side of the seat member.

vA driving wheel 23 is affixed at one end of the shaft and a locking wheel 24 at the other end in threaded engagement with the shaft. The pinion 25 isfirmly affixed to the shaft 20 at its mid point and engages the rack 26, set in the floor of the carriage at D. Rotation of the driving wheel 23 post 2 and extends therefrom to a point approxi- J The free end of the arm 27 is bored at E to receive the A cut at F allows the positioning of the pinion gear 29, which is mounted on the shaft 30. A slot at G extends from the cut F along the The shaft 30 is rotatably positioned in the arm 21. The driving-wheel 3| rigidly affixed to one end of the shaft 36 serves to rotate the pinion gear 29, which engages the rack32 set in the sleeve 28 and raises or lowers the said sleeve.

The locking wheel 33 is engaged on the threaded Figure 7 illustrates the use of a side cutting or milling bit 38 as applied to the inlay at H.

The use of the machine herein described is primarily that of making precision cuts in the form of slots or grooves in dental gold inlays, three-quarter gold crowns, full gold crowns, and the like which have been previously fitted to the teeth in the mouth of a patient, and transferred to a metal die or cast of the jaw constructed from I an impression of said jaw. These inlays are intended for attachments to abutment teeth to support precision removable dental bridges. The proper operation of removable bridges depends on the precision of the cuts made in the abutment These cuts must be perpendicular to the quire another cut at exactly degrees from the first, This machine provides the movements iii) necessary to prepare the required work in that the seat must remain continuously in the same plane and at times move in two definite directions at 90 degrees. The arrangement illustrated and described provides the means of movement with the conservation of height. The seat is designed preferably to accommodate an adjustable base as illustrated, however I do not confine myself to such a base specifically.

In operation, the base is placed in the seat with the work turned to the most convenient position. The set screws 39 are rotated to clamp the said base. The work is then positioned under the bit 38 by rotation of the Wheels l5 and 23. The bit is raised or lowered by the wheel 3| and then clamped in position by the locking wheel 33. If the direction of the out is along the rails l0 and II, the locking wheel [6 is rotated to clamp the,

carriage and the work is fed against the bit by rotation of the wheel 23. If the direction of the cut is along the rails I and 8, the seat is clamped by the rotation of the wheel 24 and the work is fed against the bit by the rotation of the wheel Hi.

The machine herein described provides a definite guide for the machining and milling required in the preparation of removable dental bridges and such modifications may be employed as lie within the scope of the appended claim and what I claim as new and desire to secure by Letters Patent is;

A milling and parallelingmachine comprising a carriage, a base and a seat, the said carriage slideably positioned on guides the said guides suspended above the base on posts, the said seat slideably positioned on a second set of guides, the said second set of guides positioned on the carriage at right angles to and below the first set of guides, racks affixed to the firstfset of guides, pinions rotatably mounted on the carriage and in engagement with the rack on the first set of guides, a second rack positioned on the carriage and a pinion rotatably mounted on the seat and in engagement with the said second rack, wheels as means to drive the said pinions and other wheels as meansto lock the said pinions, a bit rotatably mounted on the base and vertically adjusted to the seat.

EMMET E. WELCH. 

